The very idea of a bird is a symbol and a suggestion to the poet. A bird seems to be at the top of the scale, so vehement and intense is his life, large-brained, large-lunged, hot, ecstatic, his frame charged with buoyancy and his heart with song.
If you think you can do it, you can.
All birds are incipient or would-be songsters in the spring. I find corroborative evidence of this even in the crowing of the cock.
Life is a struggle, but not a warfare.
Without the emotion of the beautiful, the sublime, the mysterious, there is no art, no religion, no literature.
If we take science as our sole guide, if we accept and hold fast that alone which is verifiable, the old theology must go.